My student's are tired!

A substantial amount of research has been done into how much sleep humans need to be healthy. Sleep is crucial to our health as it is the time that allows us to rest and regenerate and gives our bodies time to deal with damage our system has sustained during the day. It has also been suggested that sleep is important because it allows us to dream and therefore lets our subconscious deal with and rationalize the events of the day. So sleep maintains or physical and psychological well-being.